This math problem is difficult than that one. I can’t work it out.
--- Would you help me with the report? It’s too difficult to work with the data.--- .
---It won’t take long to clean our school if all the students are willing to help.---Yes, I think so. ________.
--- _______ are the London Olympics?--- In about 14 months. We are looking forward to the great scene.
--- When did the old man die ?--- He ________a rainy winter evening.
---What ______ the forest of Yangzhou in the last 30 years?---Yangzhou has become much greener.